Is playing football like falling in love? That question, which would perhaps not occur to most of us watching hours of the bruising game this holiday season, is the focus of a provocative and growing body of new science examining the role of oxytocin in competitive sports.
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Gretchen Reynolds on the science of fitness.
Oxytocin is, famously, the “love hormone,” a brain peptide known to promote positive intersocial relations. It makes people like one another, especially in intimate relationships. New mothers are awash in oxytocin (which is involved in the labor process), and it is believed that the hormone promotes bonding between mother and infant.
New-formed romantic couples also have augmented bloodstream levels of the peptide, many studies show. The original attraction between the lovers seems to prompt the release of oxytocin, and, in turn, its actions in the brain intensify and solidify the allure.
Until recently, though, scientists had not considered whether a substance that promotes cuddliness and warm, intimate bonding might also play a role in competitive sports.
But the idea makes sense, says Gert-Jan Pepping, a researcher at the Center for Human Movement Sciences at the University of Groningen in The Netherlands, and the author of a new review of oxytocin and competition. “Being part of a team involves emotions, as for instance when a team scores, and these emotions are associated with brain chemicals.”
Consider, he says, what happens during soccer shootouts. For a study that he and his colleagues published in 2010, they watched replays of a multitude of penalty shootouts that had decided recent, high-pressure World Cup and European Championship games.
They found that when one of the first shooters threw his arms in the air to celebrate a goal, his teammates were far more likely to subsequently shoot successfully than when no exuberant gestures followed a goal.
The players had undergone, it seems, a “transference of emotion,” Dr. Pepping and his colleagues wrote. Emotions such as happiness and confidence are known to be contagious, with one person’s excitement sparking rolling biochemical reactions in onlookers’ brains.
In the shootouts, he says, each player almost certainly had experienced a shared burst of oxytocin, and in the rush of positive feeling, had shot better.
It is difficult, however, to directly quantify changes in oxytocin levels during sports, largely because of practical logistics. Few teams (or referees) will willingly pause games or celebrations after a thrilling play in order for scientists to draw blood.
But there are hints that physical activity, by itself, may heighten production of oxytocin. In a 2008 study, distance runners had significantly higher bloodstream levels of oxytocin after completing an ultramarathon than at the start.
More telling, in a study presented last month at the annual meeting of the Society for Neuroscience in New Orleans, male prairie voles that exercised by running on wheels over six weeks displayed changes in their nervous systems related to increased oxytocin production and bonded rapidly and sturdily with new female cage cohabitants, while unexercised males showed little interest in any particular mate.
“Lots of stresses can trigger oxytocin release, among them exercise,” says William Kenkel, a doctoral candidate at the University of Illinois at Chicago, who led the study. He continued that “it stands to reason, then,” that such exercise-related oxytocin release “could facilitate social bonding.”
What this means for competitive athletes is that, in unexpected ways, every game or race may be a kind love match. And that’s good, Dr. Pepping says.
“In any social setting that requires some form of social interaction, be it cooperation, trust or competition, we require social information to guide our behavior and a nervous system and associated brain chemicals that are sensitive to this social information,” he said. A player needs to accurately scrutinize the body language of his or her opponents and teammates in order to gauge how they will respond during the next play, he points out. They also generally benefit from a tug of fellow feeling toward teammates, their “in-group,” and antagonism toward the other team or competitors, the “out-group.”
Oxytocin facilitates the ability to read other people’s emotions, and it deepens bonds between group members and heightens suspicion of and antagonism toward those outside the group, Dr. Pepping says.
It is also believed, as blood and brain levels rise, to encourage gloating.
So oxytocin is almost certainly an essential, if unacknowledged, player in most competitions.
But people differ in how much oxytocin they produce and in how their bodies respond to the hormone, a situation that has not, to date, been considered when judging athletes and their potential, Dr. Pepping points out, or when planning training routines. “Performance is not simply a matter of physique and strength” or of technique, he says. “It is important to start taking social emotions seriously,” he says, “and in particular those linked to positive emotional experiences.”
Encourage athletes to celebrate openly after a big play or new personal record (within the bounds of what referees will tolerate, of course). High-five often. Even gloat. “A healthy degree of gloating,” prompted by squirts of oxytocin, “could well be associated with and feed an athlete’s self-confidence,” Dr. Pepping says.
Athletes, by the way, aren’t the only group affected by oxytocin in a sports setting, “Sports fans, too, experience spurts of oxytocin release,” Dr. Pepping says, including the half-hearted. “Even when you don’t much like sports,” he says, watching others high-five and leap about the living room after their favored team scores will lead “your body to release oxytocin.” At that moment, we are all a fervent Bears or Giants or Oklahoma City Thunder fan, whatever we might think, in our more sober moments, about that James Harden trade.
